Electric insulator



NANE

ed Mar. 24,1891.

(No Model.)

G,.H. GRAHAM & T GAN ELEGTRIO INSULATOR.

No. 448,956. Patent ZMWW MIA/v ATTORNEYS UNITED STATES PATENT OFFICE.

GEORGE II. GRAHAM, OF RIDGELAND, AND THOMAS GANNAXE, OF CHICAGO, ILLINOIS.

ELECTFHC INSULATGR.

SPECIFICATION forming part of Letters Patent No. 448,956, dated March 24;, 1891.

Application filed August 2, 1390. Serial No. 360,739. (No model.)

T0 at whom. it may concern.-

Be it known that we, GEORGE ll. GtmHAM, of Itidgeland, and THOMAS GANNANE, of Ohicago, both in the county of Cook and State of Illinois, have invented a new and Improved Insulator, of which thefollowing is a specification, reference being had to the annexed drawings, forming a part thereof, in which- Figure 1 is a perspective view of our improved insulator. Fig. 2 is a vertical transverse section of a modified form of the same, and Fig. 3 is a perspective view of the hook used for attaching the wire to the insulator.

Similar letters of reference indicate corresponding parts in all the views.

The object of our invention is to provide an insulator and support for telegraph, electric-light, and other electrical conductors.

Our invention consists in an insulator of glass or other suitable material adapted to screw on the usual wooden pin, and furnished in the end with a transverse groove for receiving the wire, the outside of the insulator being provided with a threaded portion for receiving a threaded ring, and in the combination, with the insulator thus formed, of a threaded clam ping-rin g, and a loop connected with the same for holding the conductor in place in the insulator.

The insulator-body A is provided with a threaded central aperture for receiving the usual insulatonsupporting pin 13, and the insulator is provided with a sleeve a, which is made larger in the internal diameter than the pin 13, thus affording an annular space for dry air. In the upper portion of the insulater is formed a transverse notch C for rc ceiving the conductorD. The body of the insulator is furnished near the upper end with a threaded portion E for receiving the threaded ring I To the notch (J is fitted a block G,

threaded ring F.

The

the ring F on the threaded portion of the insulator the conductor D is securely clamped. \Vhen it is desired to release the conductor, the ring F is unscrewed, when the loops Il may be readily removed.

In the modification shown in Fig. 2 the block G is provided with a projection passing down wardly into the notch C and bearing upon the conductor D. In this case the block G is grooved transversely, and a single loop II provided with hooks I rests in the groove, and its hooked ends are received upon the edge of the ring F, as in the other case.

Having thus described our invention, we claim as new, and desire to secure by Letters Patent- 1. An externallyscrcw-threaded insulator provided with a transverse groove in the end thereof, a screw-threaded collar fitted to the threaded portion of the insulator, and a loop or loops for clamping the conductor in the groove of the insulator, substantially as specified.

2. A telegraphic insulator provided with the externally-screwthreaded portion E and a groove 0, a collar fitted to the threaded portion, a block G, fitted to the groove 0 and adapted to bear upon the conductor, and one or more loops arranged to bear upon the block G and provided with hooks for engaging the ring I", substantially as specified.

GEO. II. GRAHAM. THOMAS G-ANNANE. \Vitnesses:

MARSHALL WAIT, STEPHEN G. KNIGHT. 

